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MYSQL MySQL 5.0 Database Administrator Certified Professional Exam, Part II Sample Questions:

1. When working with replication, why might you want to stop the SQL thread on the slave while keeping the I/O thread running? (Choose two)

A) So that events for the slave do not get backlogged on the master.
B) So that remaining events can be processed while not receiving new events from the master.
C) So that no changes are made while making backups.

2. Consider the following:
mysql> SHOW STATUS LIKE 'Qcache%'; +-------------------------+--------+ | Variable_name | Value | +-------------------------+--------+ | Qcache_free_blocks | 87 | | Qcache_free_memory | 318442 | | Qcache_hits | 11224 | | Qcache_inserts | 19215 | | Qcache_lowmem_prunes | 437 | | Qcache_not_cached | 9155 | | Qcache_queries_in_cache | 240 | | Qcache_total_blocks | 924 | +-------------------------+--------+
What can be derived from this output?

A) There is a low utilization of the query cache.
B) There is a normal utilization of the query cache.
C) There is a high utilization of the query cache.

3. Which of the following best describes why InnoDB tables should always have primary keys and why they should be short?

A) Because InnoDB uses primary keys to locate tables, and shorter keys make quicker lookups.
B) Because InnoDB stores pointers in a log to all the primary keys and shorter keys make this log smaller.
C) Because InnoDB uses primary keys to locate table rows, and shorter keys make quicker lookups.

4. Is it possible to force the join order in a query, and if so how?

A) No, it is not possible.
B) Yes it is possible use SELECT FORCE_JOIN rather than just SELECT, then list the tables in the desired order.
C) Yes it is possible simply list the tables in the desired order in your SELECT.
D) Yes it is possible, use SELECT STRAIGHT_JOIN rather than just SELECT, the list the tables in the desired order.

5. Why should log files be secured against reading by non-authorized users? (Choose two)

A) The server may be prevented from writing to the log file
B) Usernames and passwords could be revealed.
C) Data values may be read
D) Unauthorized users may alter the log contents.

Solutions: